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Difference between revisions of "Tips:Sorting an Array in Descending Order"

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<div style="float:right">Submitted By [[User:Chang y chung|chang_y_chung]]</div>
 
<div style="float:right">Submitted By [[User:Chang y chung|chang_y_chung]]</div>
  
[[Category:Tip Ready]]
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[[Category:Tip in Use]]

Revision as of 21:16, 3 October 2012

Call routines SORTN and SORTC can order an array in ascending order only. What if you want to order it in descending order? Here is an easy way!

  data _null_;
    array arr[*] v1-v5 (1 2 3 4 5);
    put "before:" (v1-v5) (= +1);
    /* reverse the variable list in a new array definition and sort */
    array rev[*] v5-v1;
    call sortn(of rev[*]);
    put "after :" (v1-v5) (= +1);
  run;
  /* on log
  before: v1=1  v2=2  v3=3  v4=4  v5=5
  after : v1=5  v2=4  v3=3  v4=2  v5=1
  */

For a detailed discussion on variable lists, see Schreier(2011).

Submitted By chang_y_chung